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<title>Problem 1679. -- [Usaco2005 Jan]Moo Volume -- 衡阳八中OJ离线版-2012-02-29</title><center><h2>1679: [Usaco2005 Jan]Moo Volume</h2><span class=green>Time Limit: </span>1 Sec&nbsp;&nbsp;<span class=green>Memory Limit: </span>64 MB<br><span class=green>Submit: </span>342&nbsp;&nbsp;<span class=green>Solved: </span>172<br>[<a href='submitpage.php?id=1679'>Submit</a>][<a href='problemstatus.php?id=1679'>Status</a>][<a href='bbs.php?id=1679'>Discuss</a>]</center><h2>Description</h2><div class=content>Farmer John has received a noise complaint from his neighbor, Farmer
Bob, stating that his cows are making too much noise.

FJ's N cows (1 <= N <= 10,000) all graze at various locations on a
long one-dimensional pasture.  The cows are very chatty animals.
Every pair of cows simultaneously carries on a conversation (so
every cow is simultaneously MOOing at all of the N-1 other cows).
When cow i MOOs at cow j, the volume of this MOO must be equal to
the distance between i and j, in order for j to be able to hear the
MOO at all.  Please help FJ compute the total volume of sound being
generated by all N*(N-1) simultaneous MOOing sessions.

给出N个数,对于任一个数i,求其它数与它的差的绝对之和,再将所有这些和再加起来.
</div><h2>Input</h2><div class=content>* Line 1: N

* Lines 2..N+1: The location of each cow (in the range
        0..1,000,000,000).

</div><h2>Output</h2><div class=content>* Line 1: A single integer, the total volume of all the MOOs.
</div><h2>Sample Input</h2>
			<div class=content><span class=sampledata>5<br />
1<br />
5<br />
3<br />
2<br />
4<br />
<br />
INPUT DETAILS:<br />
<br />
There are five cows at locations 1, 5, 3, 2, and 4.<br />
</span></div><h2>Sample Output</h2>
			<div class=content><span class=sampledata>40<br />
<br />
OUTPUT DETAILS:<br />
<br />
Cow at 1 contributes 1+2+3+4=10, cow at 5 contributes 4+3+2+1=10, cow at 3<br />
contributes 2+1+1+2=6, cow at 2 contributes 1+1+2+3=7, and cow at 4<br />
contributes 3+2+1+1=7.  The total volume is (10+10+6+7+7) = 40.</span></div><h2>HINT</h2>
			<div class=content><p></p></div><h2>Source</h2>
			<div class=content><p><a href='problemset.html?search=Silver'>Silver</a></p></div><center>[<a href='submitpage.php?id=1679'>Submit</a>][<a href='problemstatus.php?id=1679'>Status</a>][<a href='bbs.php?id=1679'>Discuss</a>]</center>﻿<br>

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